string port = "4004";

            Process pro = new Process();

            // 设置命令行、参数
            pro.StartInfo.FileName = "cmd.exe";
            pro.StartInfo.UseShellExecute = false;
            pro.StartInfo.RedirectStandardInput = true;
            pro.StartInfo.RedirectStandardOutput = true;
            pro.StartInfo.RedirectStandardError = true;
            pro.StartInfo.CreateNoWindow = true;
            // 启动CMD
            pro.Start();
            // 运行端口检查命令
            pro.StandardInput.WriteLine("netstat -ano");
            pro.StandardInput.WriteLine("exit");

            // 获取结果
            Regex reg = new Regex("\\s+", RegexOptions.Compiled);
            string line = null;
            while ((line = pro.StandardOutput.ReadLine()) != null)
            {
                line = line.Trim();
                if (line.StartsWith("TCP", StringComparison.OrdinalIgnoreCase))
                {
                    line = reg.Replace(line, ",");

                    string[] arr = line.Split(',');
                    if (arr[1].EndsWith(":" + port))
                    {
                        int pId = int.Parse(arr[4]);
                        Console.WriteLine(port+"端口的进程ID：{0}",pId);

                        int pid = Int32.Parse(arr[4]);
                        Process pro80 = Process.GetProcessById(pid);
                        // 处理该进程
                        Console.WriteLine(port + "端口的程序名：" + Process.GetProcessById(pId).MainModule.FileName);
                        break;
                    }
                }
            }

            pro.Close();